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Operating at 1.60v I would say this is most likely a Tbred B, The Tbred B that I have is an AXDA2100DUT3C AIUHB. It is only by further core information on the CPU packaging that you can tell if its an A or a B unfortunately, but running at 1.60v is quite a good indication.

If you are in the UK, then dabs is a good bet. I took a chance and ordered my 2100+ from them and got a B. I haven't seen a UK site that guarentees a Tbred B but the A's must just about be gone by now....

If you are only changing the CPU multiplier the ram will be fine. If you are changing the fsb to overclock in conjunction with the CPU multi then your ram might hold you back. Check K62s reply in the other thread.

recently I built the comp with K7s5a and my old TbredA 1700,
I made it run at 11*143Mhz BUS at 1600Mhz stable with 2100DDR

since you can't change DDR voltage I could not run it at 166Mhz where PCI is supposedly back at 33Mhz

so to OC any further then I did and keep it safe (with 143Mhz BUS, PCI is at 35.75Mhz which is bellow 10% deviation, basically safe), you will have to paint different multiplayer on Tbred (BIOS even OC BIOS doesn't support MP changing)

I think it is your motherboard holding you back. Thos boards are just horrible for overclocking. They make OK budget systems, but the performance is about 10-20% lower than the new nForce2 boards. Get a new board if you really want to overclock.